The tablets should be placed into the capacity with distilled water, the temperature of the water is +25 C (200g tablets are put into a capacity of 20 litres BUT 20g tablets should be put into a capacity of 2 litres). The water with tablets should be constantly stirred, the tablets must slowly dissolve within 10-14 days. Within 10-14 days the water should be changed twice in the capacity. IT IS NOT ALLOWED PARAFFIN OR ANY OTHER NOT SOLUBLE BINDER ADDITIVES IN THE TABLETS. The Copper sulfate content and the Aluminium Sulfate content in the tablets should be controlled by the spectrometer, the active chlorine content in the tablets is controlled by titration. IT IS NOT ALLOWED Iron (Fe), Heavy metalls (Pb, Nickel, Cd) in the tablets.